Fifteen years ago, I was an out-of-place finance reporter in San Francisco, trying to reinvent myself as a tech journalist. That's when I scored a lucky meeting with Tony Fadell and Matt Rogers, two former Apple engineers with a wild idea to make thermostats sexy. Last week, I went to see Matt Rogers again. He's still turning ordinary household objects into extraordinary gadgets at his latest startup, Mill. When I first met Fadell and Rogers above a store above the Town and Country Village Mall